// 常量定义
#include <stdio.h>

#define LENGTH 10
#define WIDTH 5
#define NEWLINE '\n'

int main()
{
    int area;

    area = LENGTH * WIDTH;
    printf("value of area : %d", area);
    printf("%c", NEWLINE);

    const int LENGTH1 = 10;
    const int WIDTH1 = 5;
    const char NEWLINE1 = '\n';

    int area1;

    area1 = LENGTH1 * WIDTH1;
    printf("value of area : %d", area);
    printf("%c", NEWLINE);
    return 0;
}